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                            <td align="center" height="20"><strong>在线练习</strong></td>
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                                所属专题：</td>
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                                    <option selected="selected" value="0">====所有专题====</option>
                                    <option value="76">防火安全与保密</option>
                                    <option value="77">化学危险品使用安全</option>
                                    <option value="79">用电安全</option>
                                    <option value="80">通识类</option>
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                                试题类型：</td>
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                                        <td colspan="2" width="100%"><input id="TestTypeTitle170" name="TestTypeTitle170" type="hidden" value="判断题" /><a id="l170" style="color:black">170</a>. 对产生有毒气体的实验应在通风橱内进行。通过排风设备将毒气排到室外，以免污染室内空气。
                                            <font color="red">（1分）共 1040 题</font>
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                                            <font color="red">参考答案：错误</font>
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                                            <font color="blue">解题分析：对产生有毒气体的实验，必须配备一些吸收有毒气体的吸收装置，这样可以降低有毒气体污染实验室或大气。
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                <td align="center" class="tablebody" height="32"> <span>选择题号:</span><select name="select1" onchange="seltestnum();">
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                        <option value="436">436</option>
                        <option value="437">437</option>
                        <option value="438">438</option>
                        <option value="439">439</option>
                        <option value="440">440</option>
                        <option value="441">441</option>
                        <option value="442">442</option>
                        <option value="443">443</option>
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                        <option value="491">491</option>
                        <option value="492">492</option>
                        <option value="493">493</option>
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                        <option value="495">495</option>
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                        <option value="497">497</option>
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                        <option value="518">518</option>
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